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Because GPS (Global Position System) units are used in a wide range of industries many brands, models and
features are available. However, most units suitable for outdoor use are similar in size, cost, and complexity to a
cell phone. Here's some help to get you pointed in the right direction.

The eastern and northern coordinates that describe a particular position on the globe

A waypoint can be a trailhead, campsite, rock formation, or a series of points on a featureless
landscape

Route mapping

Creates a set of waypoints for an area you plan to visit

Especially useful for trips to unfamiliar places

Routes

An ordered series of waypoints. When following a route, the GPS selects each waypoint.

Some units generate waypoints and automatically create a route as you travel, a handy feature if
you end up having to backtrack in bad weather or darkness

Altimeters

Indicate altitude, or feet above sea level

Very handy when hiking through mountainous terrain or when referring to a topological map

Antennae configuration / number of satellites

External antennas can often be manipulated to improve reception

Optional plug-in antennas are handy for use in cars or boats, since they allow the unit to pick
up signals in places (such as under a metal car roof) that satellite signals usually can't
penetrate

Built-in antennas are protected from breakage, and can communicate with up to 12 satellites

More satellites translate to more accurate positioning, faster updates and better reception

Connectivity

A GPS unit can be made more useful via connections to a computer or another GPS unit. Most
computer and computer accessory retailers carry the cable and software you will need to take
advantage of these features.

In addition to easy back-up, sorting, and additional mapping capabilities, connectivity allows
you to share exact information on where you're going or have been with someone else

Size

For backcountry use or when extra load weight is a concern, you may opt for a smaller, lighter
model

If you will be using the unit in complicated outdoor terrain and/or urban locales, a larger unit
with a bigger screen may be preferable

Battery life and extra weight are related. The more batteries a unit carries, the longer its
life and the heavier its weight. For long trips, the extra weight may be worth extended battery
life.

Most GPS units are equipped with a lithium battery backup memory function so information won't be
lost when batteries die

Weatherproofness

While most receivers are built to withstand some exposure to rain and snow, they probably won't
fare well if submerged in a lake or river